Date Range
The Date Range control allows you to select a specific date range for your completed items across all charts.
Selecting the dates opens a calendar window where you can choose the date range that you want to see.
There are presets to select from, such as Last 30 Days, Last Quarter, etc.
Item Filter
If you would like to filter your data view by any attribute other than workflow stage, use the Item Filter control to manage what is shown in your data view. This includes some basic issue data as well as custom fields you chose to import when you loaded the Jira data.
If I choose to filter down to just Issue Type: User Story at this global level, then the Item Filter control for an individual chart will only show the User Story option under "Type". Compare the image to the right, which is an example of an individual chart control after the global filter has been used, with the unfiltered global control image above it.